Preheat oven to 400 degrees. Bring a medium pot of salted water to a boil over hight heat. Add the pasta and cool until just tender. Drain pasta.

Put olive oil in a medium saute pan over medium heat- add chicken and cook for 3 minutes. Add onions, garlic and stir to combine. Cook until the onions are soft and chicken is cooked. Mix the chicken mixture and the pasta together. Add the canned tomatoes, mozz cheese, parsley, salt and pepper. Stir. Place the mixture in a buttered 8x8 2" baking dish. In a small bowl mix together the bread crumbs and the parm cheese. Sprinkle over the top of the pasta mixture. Dot the top with small bits of butter. Bake until the top is golden brown- about 30 minutes. Enjoy!!